1279239 - talos win-32 fileio tests can take a lot longer compared to mozilla-inbound

Status: RESOLVED DUPLICATE of bug 1274018

(Testing :: Talos, defect)

Description

[Ben Kelly [:bkelly, not reviewing]]

I was recently trying to determine if this change had a perf impact:

https://treeherder.mozilla.org/#/jobs?repo=try&revision=740d46056ef5&selectedJob=22221403

I compared it to its mozilla-inbound parent and found some big differences:

https://treeherder.mozilla.org/perf.html#/compare?originalProject=mozilla-inbound&originalRevision=9eeb5a616d4a&newProject=try&newRevision=740d46056ef573d85be789670df5594fdef5d7e2&framework=1

But looking at the graphs shows try is consistently slower on these tests:

https://treeherder.mozilla.org/perf.html#/graphs?series=%5Bmozilla-inbound,64ebe81d65563d0fda7288a1f4fedbe5c3d9363b,1,1%5D&series=%5Btry,64ebe81d65563d0fda7288a1f4fedbe5c3d9363b,1,1%5D&highlightedRevisions=9eeb5a616d4a&highlightedRevisions=740d46056ef5&timerange=86400

If I compare to a try build without my patch, I get no significant differences.

Will asked me to file a bug since this is unexpected.

Comment 1

[William Lachance (:wlach)]

Joel, do you know why this might be?

Comment 2

[Joel Maher ( :jmaher ) (UTC -8)]

I have no idea why, but I filed bug 1274018 for this a while back.